Warning sign
Height warning bells sign
What does the Height warning bells sign mean?
Bells hung over the road at a railway crossing. They ring if a vehicle is too tall to pass safely under the electric cables.
Also known as: Bells over the road
What it means
Bells give an audible warning if your vehicle is too tall for the overhead cables.
Bells are suspended over the road at some railway crossings. They give an audible warning to drivers of vehicles that exceed the safe height beneath electrified overhead cables.
If you hear them, stop. Your vehicle is too tall to pass under the cables safely.
Where you'll see it
Before electrified railway crossings.
Rules to know
Bells are suspended over the road at a railway crossing to give an audible warning to drivers of vehicles that exceed the safe height beneath electrified overhead cables.
Know Your Traffic Signs, p. 29
Common mistakes
Mistake: Driving on after hearing the bells.
Instead: The bells mean your vehicle is too tall. Stop.
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© Crown copyright. Free to reuse under the Open Government Licence v3.0, as long as the sign is reproduced accurately and not in a misleading context.
Related signs
See also
Safe height plate
Warning sign
Shows the safe height.
See also
Overhead electric cable
Warning sign
The warning sign for overhead cables.
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- Know Your Traffic Signs (Department for Transport, Sixth edition, 2023), Level crossing signs and signals, p. 29
Sign image: Department for Transport, Traffic sign images (diagram 781). © Crown copyright, reused under the Open Government Licence v3.0.
Last reviewed 11 October 2026. This page explains the sign in our own words; for the full rules, see The Highway Code. How we source and check content